The Under Armour Women's ColdGear Reactor Vest is a popular choice among women who prioritize both style and functionality in a sleeveless lightweight thermal packable activewear vest. This vest is made from a blend of polyester and elastane, providing a comfortable and stretchy fit. It features UA Storm technology, which repels water without sacrificing breathability. The ColdGear Reactor technology adapts to your activity level, providing the right amount of warmth and breathability as needed. With its sleek design and advanced technologies, this vest is perfect for outdoor workouts or casual wear.